1 files changed, 112 insertions, 0 deletions
diff --git a/src/runtime/testdata/testprogcgo/threadpprof.go b/src/runtime/testdata/testprogcgo/threadpprof.go
new file mode 100644
index 0000000000..fdeee6910d
--- /dev/null
+++ b/src/runtime/testdata/testprogcgo/threadpprof.go
@@ -0,0 +1,112 @@
+// Copyright 2016 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9,!windows
+
+package main
+
+// Run a slow C function saving a CPU profile.
+
+/*
+#include <stdint.h>
+#include <time.h>
+#include <pthread.h>
+
+int threadSalt1;
+int threadSalt2;
+
+void cpuHogThread() {
+	int foo = threadSalt1;
+	int i;
+
+	for (i = 0; i < 100000; i++) {
+		if (foo > 0) {
+			foo *= foo;
+		} else {
+			foo *= foo + 1;
+		}
+	}
+	threadSalt2 = foo;
+}
+
+static int cpuHogThreadCount;
+
+struct cgoTracebackArg {
+	uintptr_t  context;
+	uintptr_t  sigContext;
+	uintptr_t* buf;
+	uintptr_t  max;
+};
+
+static void *pprofThread(void* p) {
+	time_t start;
+
+	(void)p;
+	start = time(NULL);
+	while (__sync_add_and_fetch(&cpuHogThreadCount, 0) < 2 && time(NULL) - start < 2) {
+		cpuHogThread();
+	}
+}
+
+
+// pprofCgoThreadTraceback is passed to runtime.SetCgoTraceback.
+// For testing purposes it pretends that all CPU hits in C code are in cpuHog.
+void pprofCgoThreadTraceback(void* parg) {
+	struct cgoTracebackArg* arg = (struct cgoTracebackArg*)(parg);
+	arg->buf[0] = (uintptr_t)(cpuHogThread) + 0x10;
+	arg->buf[1] = 0;
+	__sync_add_and_fetch(&cpuHogThreadCount, 1);
+}
+
+// getCPUHogThreadCount fetches the number of times we've seen cpuHogThread
+// in the traceback.
+int getCPUHogThreadCount() {
+	return __sync_add_and_fetch(&cpuHogThreadCount, 0);
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"runtime"
+	"runtime/pprof"
+	"time"
+	"unsafe"
+)
+
+func init() {
+	register("CgoPprofThread", CgoPprofThread)
+}
+
+func CgoPprofThread() {
+	runtime.SetCgoTraceback(0, unsafe.Pointer(C.pprofCgoThreadTraceback), nil, nil)
+
+	f, err := ioutil.TempFile("", "prof")
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(2)
+	}
+
+	if err := pprof.StartCPUProfile(f); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(2)
+	}
+
+	t0 := time.Now()
+	for C.getCPUHogThreadCount() < 2 && time.Since(t0) < time.Second {
+		time.Sleep(100 * time.Millisecond)
+	}
+
+	pprof.StopCPUProfile()
+
+	name := f.Name()
+	if err := f.Close(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(2)
+	}
+
+	fmt.Println(name)
+}